Chair-seat mounting



Jam. 20, 1925. 1,523,395

' E.-D. Bu MP. r CHAIR SEAT MOUNTING Filed Jan. 5, 1922 nm 3 AW///7///7//,

. I lllllf i Patented Jan. 20, 1925.

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orator.

EDWARD D. BUMP, OF CLEVELAND, OHIO, ASSIGNOR TO THE BETTCHER STAMPING &MANUFACTURING COMPANY, OF CLEVELAND, OHZO, A CORPORATION OF OHIO.

CHAIR-SEAT MOUNTING.

Application filed January 3, 1922.

To all whom a: may concern:

Be it known that I, EDWARD D. BUMP, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Chair-Seat ltlountings,of which the following is a full, clear, and exact description,reference being had to the accompanying drawings.

This invention relates to improvements in the mountings for chairs andmore particularly to the mechanism for vertically adjusting the seats ofchairs of the revolving type. It is the general object of the inventionto improve the means for vertically adjusting the seats of such chairswherein the adjustment, is effected by means of a screw additional tothe rotary spindle. A further object of the invention is to provide anadjusting means of the character referred to which will distributeemciently the thrust received by the adjusting screw; also to providemeans whereby the said screw will be conveniently and effectivelyretained against turning in its adjusting sleeve or nut through theordinary incidents of use to which the chair is subjected. Further andmore limited objects of the invention will appear hereinafter and willbe realized in and through the construction and arrange ment of partsshown in the drawings, wherein Fig. 1 represents a side elevation of thelower part of a chair having my invention applied thereto; Fig. 2 adetail in sectional elevation of the lower portion of the adjustingscrew and of the parts cooperating therewith; Fig. 3 a sectionalelevation taken at right angles to Fig. 2; and Fig. 4 a sectional viewcorresponding to the line 4-& of Fig. 2.

Describing by reference characters the various parts illustrated herein,1 denotes the legs and 2 the hub of a chair of the type referred to, thehub receiving therewithin the lower end of the spindle 3. This spindlesupports a head 4, in the form of a casing which is reciprocably mountedupon the spindle. 5 denotes one of a pair of spider arms supporting theseat 6 and having extensions 5 pivotally connected to the easing head 4:as indicated at 5 7 denotes the usual springs which yieldingly resistthe tilting of the chair seat.

The casing 4 carries a nut which, in the embodiment herein disclosed,may be con- Serial No. 526,638.

stituted by an internally threaded sleeve 8 connected to the casing 4 byarms 9. The construction thus far described is one which is ordinarilyemployed in revoluble tilting chairs and, in its details, constitutes nopart of my invention.

Threaded into the sleeve nut 8 is the adjusting screw stem 10 by meansof which the seat carrier comprising the casing head 1 is raised andlowered on the spindle 3, thereby to raise and lower the chair seat. Themeans for mounting and operating the said screw stem are shown moreparticularly in Figs. 2, 3 and i. Above its lower end, the stem of thescrew 10 is provided with. two opposed flattened surfaces 11, therebeing a shoulder 12 formed above each of said surfaces. Below theportion comprising the surfaces 11, the screw stem is further reduced,as indicated at 13, there being a horizontal shoulder 14. providedbetween the upper end of such reduced portion 13 and the body of thestem thereabove.

The flattened surfaces 11 are for the reception of the hand wheel bywhich the screw is rotated, said hand wheel having an aperturetherethrough corresponding in shape to the cross section of that part ofthe stem which includes the surfaces 11, whereby a driving connection isestablished between said wheel and said stem. The hand wheel comprisesan upper and outer section, made preferably of sheet metal andcomprising a disk 15 having at its periphery a downturned cylindricalflange 16 tightly gripping the periphery of a washer 17 constitutingpart of a lower and inner section and having a downwardly extending hub18 provided on opposite sides thereof with. downwardly extending roundedlugs or projections 19. The aperture through the disk 15 and the hub 18is so shaped as to conform to the cross section of that part of thescrew stem which includes the surfaces 11. By the constructiondescribed, a driving connection is formed between the outer operatingportion 15, 16 of the hand wheel and the said stem.

It will be noted that the bottom of the hub 18, between the lugs orprojections 19, is in the same plane as the shoulder 14. The screw stem10 is supported jointly by said hub and shoulder on the top of anextension 21 of a collar 20, the said collar being inounted upon thespindle 3 and shown as connected thereto by a pin 22 and the saidextension having a bore 21" receiving and approximately sizing thereduced portion 13 of said stem. The collar in turn is supportedupon theupper cap 23 of the hub 2.

Itwill be noted,'by reference to Figs. 2 and 3, that the extension 21 ofthe collar is provided with concave notches 21* complementary to theconvex lower ends of the projections 19, but that, when the projectionsare in registerwith said notches, a clearance isprovided between thenotches and-projections. This not'only relieves the projections and'n'otches of'wear, but also preventsthe projections from riding tooeasily out of the notches during the ordinary use of the chair and thusprevents the screw 10 from turning in its nut 8 during such ordinaryoperation.

While I have shown my invention as applied'to a non-reciprocable spindlehaving a reciprocable head casing thereon, it is obvious that it may beused with a reciprocabl'e. spindle having the head casing rigidtherewitlnin which case the connecting pin 22 willbe omitted, allowingthe spindle to move upand down through the collar which will besupported solely and directly by the plate23.

Having thus described my invention, what I claim is: j

1. In a-device of the character described, the combination of a spindle,a seatcarrier thereon, a nut connected with said carrier, a collarmounted on said spindle and having a projection provided with a bore, ascrew stem'threadedin said nut and having its lower end mounted in saidhere. the portion 7 of thescrew stem above such collar extension havinga shoulder thereon, and a hand -wheel. on said stein below said shoulderand stem threaded in'said nut and havingitsf lower end mounted in saidbore, the portion of the screw stem above such collar extension beingnon-circular in section and having a shoulder above such section, and ahand wheel mounted upon thenon-circular por' tion of said steni'andadapted to engage said shoulder withits upper surface and provided witha central portion or hub adapted to eiigage the collar extension.

3. In a device Ofthfi character described, the combination of a spindle,a seat carrier thereon, a nut connected with said carrier, a collarmounted on said spindle and having a projection provided with a bore, ascrew stem threaded in said nut and having its lower end mounted in'saidbore, a hand wheel comprising a washer mounted on said stem and having adepending hub,-a disk also mounted "on said stem whereby the latter isadapted to be rotated bysaid wheel, and having a peripheral flangeclosely embracing said washer, the said hand wheel having a drivingconnection with said stem and the'stemhaving a shoulder overhanging'andengaged by the central portion oi said disk and'h'aving its lower endportion reducedand extending below said hub, said stem having a shoulderin the plane of the bottom of said hub whereby the saidshoulder and hubjointly support the said'ste'm from the collarex'tension, and

interen'gaging projections andinotches carried by said hub and extensionto resist the rotation of said screw. I,

4-. In a device of the character described,

the combination of a spindle, a seat carrier thereon, a nutconnected'with said carrier, a collarmoui'ited on'said'spindle andhaving a projection 'provided with a bore, a screw stem threaded in saidnut and having its lower end mounted in said bore, a hand wheelcomprising a washer n ounted" on said stem and having a depending hub,ametal disk also'mounted on saidstem and having a peripheral flangeclosely embracing said washer, the said hand wheel having a driv-' ingconnection with saidstem and the stem having a shoulder overhanging andengaged by the central portion of said 'disk'and' having its said lowerendpo'rtion' reducedand extending below said hub, said stem having ashoulder cooperating with the bottom of said hub jointly to support thesaid stem from the collar extension. 7 I

In testimony whereof, Ifhere'unto afiix my signature. a

EDWARD D. BUMP.

